TA Timer Configuration for NB-IoT Small Data Transmission
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Solution Overview
Problem
In NB-IOT, defining the timing advance (TA) timer for small data transmission (SDT) procedures is challenging due to the presence of multiple configured grant (CG) resources, as the existing methods do not provide a clear method for selecting the appropriate CG resource for timing alignment.
Innovation Solution
A method for a user equipment (UE) to determine the TA timer value based on the period of a selected CG resource, which can be the maximum, minimum, average, or median period among multiple CG resources, and to restart timers based on data transmission and RRC state changes, ensuring valid timing advance for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple CG resources are configured for SDT procedure, then data transmission flexibility is improved, but determining TA timer value becomes complex and uncertain
Solution Approach 1:
The patent applies parameter changes by selecting different CG resources based on varying conditions such as data size, QoS requirements, and channel status. The TA timer value is dynamically adjusted according to the selected CG resource's period, transforming a static timer configuration into a dynamic one that adapts to different transmission scenarios, thereby resolving the complexity of TA timer determination while maintaining multiple CG resources for flexibility
Solution Approach 2:
The patent implements dynamics by making the TA timer configuration adaptive rather than fixed. The system dynamically selects among multiple CG resources and correspondingly adjusts the TA timer value based on current transmission needs, allowing the timing advance mechanism to respond flexibly to changing conditions while maintaining proper timing alignment
2Duration of action of moving object
If TA timer value is extended to cover multiple CG resources, then timing advance validity is improved, but timing alignment accuracy deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the timing management into separate segments corresponding to different CG resources. Each CG resource can have its own associated TA timer value or validity period, allowing precise timing control for each resource while collectively covering multiple resources. This segmentation maintains timing alignment accuracy for individual resources while providing extended coverage across multiple CG resources
Solution Approach 2:
The patent implements local quality by applying different TA timer configurations to different CG resources based on their specific characteristics. Each CG resource can have locally optimized timing parameters suited to its period and usage pattern, ensuring that timing advance validity is extended across multiple resources while maintaining high timing alignment accuracy for each individual resource
Data Source
AI summary
Embodiments of the present application are directed to a method and apparatus for configuring timers and performing data transmission in a SDT procedure. In an embodiment of the present application, the method includes: receiving configured grant (CG) resource configuration information on a plurality of CG resources from a base station (BS); and determining a value of timing alignment (TA) timer based on a period of one selected CG resource from the plurality of CG resources or based on a value configured by the BS; and transmitting data in at least one of the plurality of CG resources if the TA timer is running and the at least one of the plurality of CG resources is valid.